linux-hardening - Re: [PATCH][next] scsi: aacraid: Replace one-element array with flexible-array member

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Date:   Wed, 24 Mar 2021 21:18:14 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] scsi: aacraid: Replace one-element array with
 flexible-array member


Hi Gustavo!

Your changes and the original code do not appear to be functionally
equivalent.

> @@ -1235,8 +1235,8 @@ static int aac_read_raw_io(struct fib * fib, struct scsi_cmnd * cmd, u64 lba, u3
>  		if (ret < 0)
>  			return ret;
>  		command = ContainerRawIo2;
> -		fibsize = sizeof(struct aac_raw_io2) +
> -			((le32_to_cpu(readcmd2->sgeCnt)-1) * sizeof(struct sge_ieee1212));
> +		fibsize = struct_size(readcmd2, sge,
> +				     le32_to_cpu(readcmd2->sgeCnt));

The old code allocated sgeCnt-1 elements (whether that was a mistake or
not I do not know) whereas the new code would send a larger fib to the
ASIC. I don't have any aacraid adapters and I am hesitant to merging
changes that have not been validated on real hardware.

-- 
Martin K. Petersen	Oracle Linux Engineering